diff --git a/src/hb-gobject-enums.h.tmpl b/src/hb-gobject-enums.h.tmpl
index a846786..6dd98f7 100644
--- a/src/hb-gobject-enums.h.tmpl
+++ b/src/hb-gobject-enums.h.tmpl
@@ -43,7 +43,7 @@
 
 /*** BEGIN value-header ***/
 HB_EXTERN GType
-@enum_name@_get_type () G_GNUC_CONST;
+@enum_name@_get_type (void) G_GNUC_CONST;
 #define @ENUMPREFIX@_TYPE_@ENUMSHORT@ (@enum_name@_get_type ())
 
 /*** END value-header ***/